Feature●Military Packing List Envelopes, 8.5" x 10"●Box of 500, End Loading●"PACKING LIST ENCLOSED" Printed on Front●Military Spec. PPP-E-540C, CLASS 1, STYLE 4Description Box of 500 military packing list envelopes, 8.5" x 10", end loading. PACKING LIST ENCLOSED imprint. Military spec. PPP-E-540C, Class 1, Style 4.